JPH01267320A - Four-cycle internal combustion engine - Google Patents

Abstract

PURPOSE:To process double mixed gas and secure the extent of double output power by installing an intake for the mixed gas in a crankcase via a check valve being opened to the inside of this crankcase, while connecting this crankcase to an intake port via another check valve or the like being opened to the outside of the crankcase. CONSTITUTION:In a crankcase 20 formed in the lower part of a cylinder 1, there is provided with an intake 23 for mixed gas via a check valve 21 being opened to the inside of this crankcase 20. Then, the crankcase 20 is connected to an intake port 11 of the cylinder 1 via a check valve 22 being opened to the outside of the crankcase 20 and a connecting pipe 3. With this constitution, the mixed gas is taken into the crankcase 20 extending for two times of both compression and exhaust strokes in one cycle of a 1-cycle engine. The mixed gas taken in the crankcase 20 is fed to a cylinder chamber 10 formed in an upper part in the cylinder 1 at a time through one time suction stroke. Consequently, as compared with the conventional engine in which the cylinder 1 has the same volume, it can secure as much as double output power.

Description

DETAILED DESCRIPTION OF THE INVENTION (Objective of the Invention) The present invention provides a four-cycle system that operates as a motion cycle of suction of a mixed gas of air and fuel into a cylinder, compression in the cylinder, explosion, and exhaust from the cylinder. It relates to internal combustion engines, and provides a large output with a constant cylinder volume, a smooth and uniform increase in output at each stage from low-speed motion to high-speed motion, and a simple structure. is its purpose.

In internal combustion engines, those with large cylinder volumes are
It is natural that a larger output can be obtained compared to an engine with a smaller cylinder volume, but an engine with a larger cylinder volume not only requires a larger overall engine size, but also has a negative impact on general use, especially in automobiles including two-wheeled vehicles. Regardless of whether it is a competitive engine or not, there are various regulations regarding the cylinder volume of engines, so there is a strong demand among consumers for engines that can obtain large output with a small cylinder volume.

In response to this demand, automobile turbochargers have been developed and are already installed in automobiles as accessories to many engines. There are two types of turbochargers: those that derive the required power from the rotating shaft of the engine, and those that are driven by the engine's exhaust gas flow. In order to ensure sufficient quantity, most automobiles currently use the latter type of drive system. However, in this case, when the engine is operating at low speed, the required air compression force cannot be obtained due to the insufficient rotation speed of the turbo fan, resulting in poor engine torque characteristics at low speed and poor response to acceleration operations. In addition, the amount of compressed air sent before and after the carburetor by the turbocharger is not necessarily directly proportional to the amount of fuel vapor generated in the carburetor, so each stage of engine operation up to low speed is smooth and consistent. You cannot expect an increase in output.

The present invention overcomes the above-mentioned drawbacks of the supercharging mechanism in conventional automobile engines, which operates the carburetor in the presence of compressed air generated by a turbofan, and also enables the engine to operate without increasing the cylinder volume. This made it possible to significantly increase output.

(Structure of the Invention) The present invention will be described below with reference to the attached drawings.
Each of the drawings to FIG. 6 shows an internal combustion engine that operates as a movement cycle consisting of four strokes: an intake stroke, a compression stroke, an explosion stroke, and an exhaust stroke of a mixed gas. In this invention, the crank chamber 20 has no through hole such as a bleeder and is closed to the outside. This crank chamber 20 is provided with a mixed gas intake port 23 via a check valve 21 that opens into the crank chamber. However, in the drawings, numeral 8 indicates a carburetor that generates a mixed gas of fuel and air sent from a fuel pump by sucking air from the outside. The crank chamber 20 has a check valve 22 that opens to the outside of the crank chamber.
It is connected to the intake boat 11 of the cylinder 1 via a connecting pipe 3, and this connecting pipe 3 is capable of temporarily storing the above-mentioned mixed gas. If the storage capacity is insufficient, it is also possible to provide a surge tank 31 as a part of the connecting pipe 3, as shown in FIG.

As mentioned above, this invention operates according to a motion cycle consisting of four strokes: suction, compression, explosion, and exhaust of a mixed gas. 4 shows the initial state of the explosion stroke, and FIG. 6 shows the initial state of the exhaust stroke. That is, if we look at the intake valve 13 and exhaust valve 14 in the cylinder head, the intake valve 13 is open during the intake stroke (Figs. 1 and 2), the exhaust valve 14 is closed, and during the compression stroke (Fig. 3) and During the explosion stroke (FIGS. 4 and 5), the intake valve 13 and the exhaust valve 14 are both closed, and during the exhaust stroke (FIG. 6), the intake valve 13 is closed and the exhaust valve 14 is open.

Since the present invention is constructed as described above, the operation of the engine according to the present invention will be described below in accordance with the general description of a four-stroke internal combustion engine and in accordance with the order of the engine's motion strokes.

□Suction stroke□ As described above, FIG. 1 shows the initial state of the suction stroke, but as described above, in this invention, the crank chamber 20 is closed to the outside, and the crank chamber 20 has an indoor Since a mixed gas inlet is provided through a check valve that opens at Gas can be compressed. On the other hand, as described above, the crank chamber 20 is
It is connected to the intake port 11 via a check valve 22 that opens to the outside and a connecting pipe 3 that can temporarily store the mixed gas, so that when the piston 5 is descending, the inside of the crank chamber 20 is can be delivered to the intake port 11 of the cylinder. However, in this case, when the intake boat 11 is closed by the intake valve 13, the mixed gas pressurized and sent out in the crank chamber 20 is stored under pressure in the connecting pipe 3.

Therefore, the reason will be explained later in the exhaust stroke, but as a premise for explaining the suction stroke, the mixed gas sucked in from the intake port 23 exists in the crank chamber 20, while the gas mixture in the connecting pipe 3 is under pressure. The suction process will be explained assuming that a certain gas mixture exists.

That is, in the intake stroke, the intake valve 13 is closed at the beginning of the intake stroke.
is opened and the piston 5 begins to descend.At this time, even if the exhaust valve 12 is closed, the cylinder chamber 10 has been exhausted and is at normal pressure, so the pressurized air stored in the connecting pipe 3 is released. A mixed gas is supplied to the cylinder chamber 10.

On the other hand, the mixed gas in the crank chamber 20 is compressed by the descent of the piston 5, but as shown in FIG. When the pressure increases sufficiently, the check valve 22 opens,
It is fed into the cylinder chamber 10 through the connecting pipe 3.

□Compression stroke□ In the compression stroke shown in Fig. 3, the mixed gas sucked into the cylinder chamber 10 as described above is compressed by the piston 5, while negative pressure is generated in the crank chamber 20, so a non-return check is performed. The valve 21 opens and the mixed gas is sucked into the crank chamber 20 through the intake port 23.

□ Explosion stroke □ As shown in the figure, the mixed gas compressed in the cylinder chamber 10 during the compression stroke is ignited by the spark of the ignition plug 7, combusts and expands explosively, and the piston 5 descends due to the expansion of the gas. , gives rotational power to the crankshaft 6. On the other hand, the mixed gas sucked into the crank chamber 20 during the compression stroke is compressed as the piston 5 descends, as in the case of the suction stroke described above, and in the middle of the explosion stroke shown in FIG. It overcomes the internal pressure of the pipe 3, opens the check valve 22, and is fed into the connecting pipe 3. However, since the intake valve 13 is closed during the explosion stroke, the mixed gas fed into the connecting pipe 3 is temporarily stored in the connecting pipe 3 under pressure.

□Exhaust stroke□ At the end of the explosion stroke, the exhaust valve 14 opens and the exhaust stroke shown in FIG. 6 begins. On the other hand, as the piston 5 rises,
Since a negative pressure is generated in the crank chamber 20, the check valve 21 opens, and the mixed gas is sucked into the crank chamber 20 through the intake port 23, as in the case of the compression stroke shown in FIG.

In this way, the engine according to the present invention, seemingly similar to the -S four-stroke engine, completes one movement cycle, returns to the intake stroke, and begins the next movement cycle, as can be understood from the above. As described above, according to the present invention, a mixed gas is drawn into the crank chamber 20 from the outside twice during the compression stroke and the exhaust stroke during one movement cycle of the engine, and these mixed gases are
It is supplied to the cylinder chamber IO at 1 o'clock in the suction stroke. Needless to say, the amount of mixed gas sucked into the crank chamber 20 through the intake port 23 at one time is equal to the volume of the cylinder chamber 10 when the piston 5 is at the bottom dead center, and is equal to the volume of the cylinder chamber 10 when the piston 5 is at the bottom dead center. Equal to the amount of mixed gas supplied to the cylinder chamber during the movement cycle. Therefore, in one motion cycle of the engine according to the present invention, twice the amount of mixed gas is supplied to the cylinder chamber 10 at 1 o'clock in the suction stroke, and the mixed gas goes through the compression stroke and explodes and expands in the explosion stroke. and drives the crankshaft 6.

(Effects of the Invention) Thus, according to the present invention, the engine consumes twice as much gas mixture during one movement cycle as a normal four-stroke engine with the same cylinder volume, and thus obtains twice the power. Not only is this possible, but unlike supplying mixed gas using a turbocharger, by changing the gas valve opening, smooth and even output changes can be obtained from low-speed to high-speed operation. The response to acceleration operations is reliable. Moreover, according to this invention, there is no cost increase due to the addition of a turbo fan to increase output.
Since the mechanism is extremely simple, it will greatly contribute to improving the ability to use automobiles, including two-wheeled vehicles, and to the development of the automobile industry.

[Brief explanation of the drawing]

The drawings are conceptual diagrams for explaining the motion stroke of the engine according to the present invention, in which FIG. 1 shows the beginning of the suction stroke, FIG. 2 shows the middle stage of the suction stroke, FIG. 3 shows the beginning of the compression stroke, and FIG. 5 shows the initial state of the explosion stroke, FIG. 5 shows the intermediate stage of the explosion stroke, and FIG. 6 shows the initial state of the exhaust stroke. 1 is a cylinder, 10 is a cylinder chamber, 11 is an intake boat,
12 is an exhaust boat, 13 is an intake valve, 14 is an exhaust valve, 2 is a crankcase, 20 is a crank chamber, 21.22 is a check valve, 23 is an intake port, 3 is a connecting pipe, 31 is a surge tank,
4 is an exhaust pipe, 5 is a piston, 51 is a connecting rod, 6 is a crankshaft, 61 is a flywheel, 7 is a spark plug, and 8 is a carburetor.

Claims (1)

[Claims] (1) In an internal combustion engine that operates through a motion cycle consisting of an intake stroke, a compression stroke, an explosion stroke, and an exhaust stroke of a mixed gas of fuel and air, a check valve that opens into a crank chamber that is closed to the outside. The crank chamber is connected to the intake port of the cylinder through a check valve that opens to the outside of the crank chamber and a connecting pipe that can temporarily store the mixed gas.
cycle internal combustion engine.